Borehole Pump, Installation Procedure And Replacement Procedure

ABSTRACT

A borehole pump including an eccentric screw pump with at least one stator and at least one rotor. The eccentric screw pump has, in its upper end region, in each case an upper sealing arrangement and, in its lower end region, in each case a lower sealing arrangement. The borehole pump includes a receiving housing having a lower sealing region and at least two upper sealing regions, wherein the eccentric screw pump is arranged in the receiving housing such that the lower sealing arrangement of the eccentric screw pump is assigned in a form- and/or force-fitting manner to the lower sealing region of the receiving housing and such that the upper sealing arrangement of the eccentric screw pump is assigned in a form- and/or force-fitting manner to one of the at least two upper sealing regions of the receiving housing. An installation procedure for installation at a lower end of a riser pipe and a replacement procedure for replacing a borehole pump arranged at a lower end of a rise pipe are also disclosed.

TECHNICAL FIELD

The present invention relates to a borehole pump, a procedure for installing a borehole pump and a procedure for replacing a borehole pump, in accordance with the features of the generic terms in the patent claims.

BACKGROUND

The present invention relates to a borehole pump for extracting viscous or partly viscous media from a borehole. In addition, the present invention relates to a method for installing a borehole pump and a method for replacing a borehole pump.

Eccentric screw pumps known from the prior art are made up of a rotor and a stator, such that the rotor is inserted in the stator and moves eccentrically in the stator. From the movement of the rotor and reciprocal mounting of rotor and stator, wandering conveyor spaces are formed between the stator and the rotor by means of which liquid and or granular media can be transported along the stator. For example, eccentric screw pumps are appropriate for conveying water, petroleum and a number of other liquids. To form the conveyor spaces and to be able to convey the respective medium under conveyor pressure with the least possible backflow, the rotor is contiguous with an interior wall of the stator made up of elastic material. Such an eccentric screw pump is known, for example, from patent DE 10 2010 037 440 A1.

Such eccentric screw pipes known from the prior art can be installed, for example, in boreholes, in particular in riser pipes inside the boreholes, in order to convey the respective liquid or partly liquid medium out of the borehole.

For an intended replacement of the respective eccentric screw pumps or to remove the respective eccentric screw pipe from the borehole for the purpose of maintenance or the like, then, using embodiments known in the prior art, an expensive de-installation process is necessary, in which anchorings of the riser pipe, in which the eccentric screw pump is arranged, must be removed. There would be considerable demand for systems in which eccentric screw pumps can be removed from a borehole in a simplified manner. A system of such a type is disclosed, for example, in patent DE 102013108493 A1. In this case, a pump unit with an eccentric screw pump, comprising a stator and a rotor along with a drive train connected with the rotor, is fastened in a riser pipe of a borehole, such that the eccentric screw pump is held in the riser pipe by means of an adapter unit. The adapter unit is connected with the stator and holds the stator essentially immovably in the riser pipe by a clamping device on the riser pipe.

SUMMARY

The object of the invention consists in providing a borehole pump, which is particularly easy to replace and/or to maintain.

The aforesaid object is achieved by means of a borehole pump, a method for installing a borehole pump and a method for replacing a borehole pump, which comprise the features described in the invention.

The invention relates to a borehole pump for conveying viscous or partly viscous media from a borehole. The borehole pump comprises an eccentric screw pump with at least one stator and at least one rotor, which is arranged inside a special receiving housing. The at least one rotor of the eccentric screw pump is received while eccentrically rotating in the at least one stator of the eccentric screw pump. The stators each thus have one lining, which is brought into contact with the one or more rotors.

The lining consists, for example, of an elastomer or other metal. If the one or more rotors are moved by eccentric rotation, then between the one or more rotors and the lining, conveyor spaces are formed, which migrate along the eccentric screw pump and move the respective medium by means of the eccentric screw pump and/or by means of the migrating conveyor spaces.

If several stators are present, then it is meaningful for them to be oriented axially flush with one another. For the relevant person skilled in the art, it is clear that, depending on the respectively intended extension of the eccentric screw pump or of the respective depth of the borehole, any desired number of stators can be provided that can be connected, in some cases firmly and in a sealed manner, with one another.

The eccentric screw pump comprises an upper sealing arrangement in its upper end region and a lower sealing arrangement in its lower end region, by means of which the eccentric screw pump can be arranged in sealed manner inside the receiving housing. For this purpose the receiving hosing comprises a lower sealing region and at least two upper sealing regions. In particular, the eccentric screw pump is arranged in the receiving housing in such a way that the lower sealing arrangement of the eccentric screw pump is assigned in a form- and/or force-fitting manner to the lower sealing region of the receiving housing; and that the upper sealing arrangement of the eccentric screw pump on the upper end region is assigned in a form- and/or force-fitting manner to one of the at least two upper sealing regions of the receiving housing.

If at least two sealing regions are referred to in the context of the application, then, according to one embodiment of the invention, they are understood to be two regions spatially distanced from one another. They can be distinguished in their structure and/or their composition from a region situated between them. For example, the at least two upper sealing regions are formed by sealing sleeves, which are separated from one another by a pipe piece or something similar. Alternatively, the at least two upper sealing regions and the distancing region between them can also be formed by a continuous long pipe. The long pipe comprises, in particular, an inner diameter, which corresponds to the inner diameter of two upper sealing regions configured as separated from one another according to the aforementioned embodiment, so that at any desired position over the entire length of the long pipe a seal seating can be formed between the contact surface and the upper sealing arrangement of the eccentric screw pump. In this alternative embodiment, greater length variability among insertable eccentric screw pumps is possible.

The formulation “at least two sealing regions” thus includes every arrangement in which at least two spatially distanced seal seatings can be formed between a contact surface in the upper region of the receiving housing and a sealing arrangement of the eccentric screw pump.

The receiving housing is essentially of pipe-like shape and comprises an inner diameter that is at least slightly greater than a maximum outer diameter of the eccentric screw pump. Depending on the length of the receiving housing, it can comprise a number of pipe segments axially aligned with one another, which are connected by soldering seams, connecting sleeves or the like.

The at least two upper sealing regions of the receiving housing are at an individually defined distance from the upper sealing region, such that the distances are clearly distinguished from one another. Thus it is possible for eccentric screw pumps of different length can be arranged inside the receiving housing, in particular eccentric screw pumps having a different distance between the respective upper sealing arrangement and the respective lower sealing arrangement. For example, in a first eccentric screw pump, the distance between the upper sealing arrangement and the lower sealing arrangement corresponds essentially to a first distance between the upper sealing region and a first upper sealing region of the receiving housing. In addition, in a second eccentric screw pump, the distance between the upper sealing arrangement and the lower sealing arrangement can correspond essentially to a second distance between the lower sealing region and a second upper sealing region of the receiving housing, which in particular is formed below the first upper sealing region. Thus it results that the first distance is greater than the second distance and thus the first eccentric screw pump comprises a greater length than the second eccentric screw pump.

The borehole pump, depending on the number of upper sealing regions of the receiving housing, can therefore be equipped with one eccentric screw pump of various length in each case. For example, before the oil begins to be conveyed for the initial draining of the borehole, an eccentric screw pump having a long stator consisting at least in some areas of elastomer can be arranged in the receiving housing. For extended-time conveyance, it is then possible to switch to a shorter corrosion-resistant all-metal stator, in that the eccentric screw pump can simply be replaced inside the receiving housing of the borehole pump, without the riser pipe needing to be extended. The use of a shorter all-metal stator is advantageous, for example, for reasons of cost.

According to one embodiment of the invention, the at least two upper sealing regions of the receiving housing are identically formed, at least in some areas, and each comprise a contact surface for the upper sealing arrangement arranged in the upper end region of the respective eccentric screw pump. For example, the upper sealing regions are of cylindrical shape and, through their inner wall lining, a smooth contact surface for the upper sealing arrangement of the eccentric screw pump. For example, the upper sealing arrangement of the eccentric screw pump comprises a sealing element in the form of a lamellar elastomer sealing or other appropriate sealing element. Between the sealing element of the upper sealing arrangement of the eccentric screw pump and the contact surface of one of the at least two upper sealing regions of the receiving housing, a form- and/or force-fitting operative connection is preferably established, which seals off the pump body of the eccentric screw pump from the receiving housing.

The receiving housing is arranged and fastened at the lower end of the riser pipe situated in the borehole. For example, the receiving housing of the borehole pump is screwed onto the lower end of the riser pipe. The borehole pump is thus arranged inside the riser pipe in a not conventionally known manner. Instead, the borehole pump is fastened onto the riser pipe at its lower end.

In order to vary still further the eccentric screw pump that is to be employed, it can be foreseen, according to one embodiment, that the cylindrical-shaped stator of the eccentric screw pump comprises an upward extension, in particular in the form of a pipe. The extender pipe thus advantageously has the same diameter or outer periphery as the stator. The coupling rod for driving the rotor of the eccentric screw pump is situated, for example, at some point within the extension. The upper sealing arrangement of the eccentric screw pump, in particular, is arranged in the upper end region of the extension. By varying the length of the stator of the eccentric screw pump and the length of the extension, further eccentric screw pumps can thus be installed as needed. It is always important here that the distance between the respective upper sealing arrangement and the respective lower sealing arrangement of the eccentric screw pump corresponds in each case to a distance between the lower sealing region of the receiving housing and one of the upper sealing regions of the receiving housing.

According to a preferred embodiment, the lower sealing arrangement of the eccentric screw pump comprises at least one sealing element and first anchoring elements. Preferably the lower sealing region of the receiving housing comprises at least one contact surface for the at least one lower sealing element of the eccentric screw pump, so that in arranging the eccentric screw pump inside the receiving housing in addition to the sealing already described above in the upper end region, a sealing operative connection is produced between the sealing element of the eccentric screw pump and the lower sealing region of the receiving housing and thus seals off the pump body of the eccentric screw pump from the receiving housing. According to one embodiment of the invention, the sealing element of the lower sealing arrangement of the eccentric screw pump is a lamellar elastomer sealing, which seals off the eccentric screw pump from the contact surface of the receiving housing.

Second anchoring elements are preferably assigned to the lower sealing region of the receiving housing, said anchoring elements configuring with the first anchoring elements of the eccentric screw pump a form- and force-fitting operative connection. The eccentric screw pump is thereby held securely inside the receiving housing; in particular, the necessary retaining power can be applied by means of the corresponding selection of suitable anchoring elements.

Preferably it can be foreseen that the anchoring elements are connected with one another securely in an initial operating position of the borehole pump, and are easily separable from one another in a second operating position of the borehole pump. It can be foreseen, for example, that the eccentric screw pump on being inserted into the receiving housing is rotated in the same rotation direction that corresponds to the rotation direction of the rotor in the conveyor operation. As a result of rotation in the rotation direction, a secure connection is established between the first anchoring elements of the eccentric screw pump and the second anchoring elements of the receiving housing. To release this connection again, the eccentric screw pump must be rotated with respect to the receiving housing, in a rotation direction corresponding to the opposite direction of the rotor in conveyor operation. This prevents the first and second anchoring elements from becoming separated from one another while in an ongoing conveyor operation.

According to one embodiment of the invention, the first anchoring elements are configured as protruding hooks and the second anchoring elements as corresponding recesses. By engaging the hooks in the recesses, a removable catch connection, for example, is established between the eccentric screw pump and the receiving housing.

On the basis of the aforementioned removable connection between the receiving housing and the eccentric screw pump, the borehole pump can be replaced and/or maintained relatively easily without the need to disassemble the riser pipe.

It is foreseen, according to an alternative embodiment, that the anchoring elements are connected differently with one another, possibly in a firm connection, for example, by soldering or the like.

Because of the at least two upper sealing regions of the receiving housing and the variability of the stator length in connection with a previously described extension, various eccentric screw pumps having various stator lengths can thus be employed within the borehole pump. In particular, the embodiment of an aforementioned long tube comprises a number of possible upper sealing regions, which in each case are at a different distance from one another. The range of possible usable stator lengths is thus increased further.

The invention also relates to a procedure for installing a borehole pump at a lower end of a riser pipe, in particular a procedure for installing a previously described borehole pump comprising an eccentric screw pump arranged in a special receiving housing.

First, the receiving housing of the borehole pump is fastened at a lower end of the riser pipe, for example, by means of a screwing connection or the like. This can be carried out, for example, in the process of one of the first working steps to arrange the riser pipe in the borehole. After complete installation of the riser pipe, the previously described eccentric screw pump, which is fastened on a pump rod and has an upper sealing arrangement and a lower sealing arrangement, is inserted into the receiving housing. In particular, the eccentric screw pump fastened on the pump rod is lowered by it into the receiving housing only after complete installation of the riser pipe. Installation of the receiving housing of the borehole pump on the riser line and installation of the eccentric screw pump of the borehole pump thus occur at decidedly different times from one another. Upon inserting the eccentric screw pump in the receiving housing, a sealing arrangement of the eccentric screw pump occurs in the receiving housing between the lower sealing region of the receiving housing and one of the at least two upper sealing regions of the receiving housing.

Upon replacing a borehole pump arranged at a lower end of a riser pipe, only the eccentric screw pump, in particular, is separated from the receiving housing of the borehole pump fastened at the lower end of the riser pipe and is removed by means of the pump rod through the riser pipe. Thereafter, a new eccentric screw pump is fastened on the pump rod, inserted through the riser pipe and arranged and sealed inside the receiving housing between the lower sealing region and one of the at least two upper sealing regions of the receiving housing.

Depending on whether the length of the eccentric screw pump corresponds to the distance between the lower sealing region and the first upper sealing region or else to the distance between the lower sealing region and the second upper sealing region, it can be necessary that the pump rod must be lengthened or shortened accordingly.

Alternatively or in addition to the described features, the procedure can comprise one or more features and/or properties of the device previously described. Likewise, the device, alternatively or additionally, can comprise single or multiple features and/or properties of the previously described procedure.

BRIEF DESCRIPTION OF THE DRAWINGS

Hereinafter, embodiments of the invention and their advantages are disclosed in greater detail with reference to the enclosed drawings. The size proportions of the individual elements in the drawings to one another do not always correspond to the true size proportions, because individual shapes are illustrated in simplified manner and other shapes are increased in size in proportion to other elements for the purpose of clearer demonstration.

FIGS. 1A through 1C each show components of two embodiments of an inventive borehole pump.

FIGS. 1D and 1E each show different embodiments of an inventive borehole pump.

FIG. 2 shows a receiving housing of an inventive borehole pump.

FIG. 3 shows a cross-section through a first eccentric screw pump of an inventive borehole pump.

FIG. 4 shows a cross-section through a first eccentric screw pump of an inventive borehole pump, which is arranged in the receiving housing.

FIG. 5 shows a receiving housing of an inventive borehole pump analogous to FIG. 2.

FIG. 6 shows a cross-section through a second eccentric screw pump of an inventive borehole pump.

FIG. 7 shows a cross-section through a second eccentric screw pump of an inventive borehole pump arranged in the receiving housing.

For identical, or identically acting, elements of the invention, identical reference numbers are used. In addition, for purposes of clarity, the individual drawings include only reference numbers that are required for the description of the particular drawing. The illustrated embodiments constitute only examples of how the inventive device or the inventive procedure can be configured and do not represent exclusive limitations.

DETAILED DESCRIPTION

FIGS. 1A through 1C each show components of two embodiments of an inventive borehole pump 1, 1 a, 1 b according to FIGS. 1D and 1E.

An inventive borehole pump 1, 1 a, 1 b comprises a receiving housing 10 (compare, in particular, FIG. 1A), that is arranged at the lower end of a pipe riser 20 situated inside a borehole. The receiving housing 10 comprises a lower sealing region 11 and at least two upper sealing regions 12-1, 12-2. The at least two upper sealing regions 12-1, 12-2 are at a defined distance A from one another. The at least two upper sealing regions 12-1, 12-2 are preferably identical in configuration and form contact surfaces 16. In the illustrated embodiment, the two upper sealing regions 12-1, 12-2 each comprise a smaller inner circumference or inside circumference than the other regions of the receiving housing 10.

According to an alternative embodiment, which is not illustrated, the region between the at least two upper sealing regions 12-1, 12-2 can be configured as identical to the two upper sealing regions 12-1, 12-2, so that this middle region forms at least one additional contact surface and thus at least one additional upper sealing region. For example, the at least two upper sealing regions 12-1, 12-2 and the region between them are formed by a continuous long pipe having a defined inner diameter or inner circumference, so that inside the tube a number of possible upper sealing regions make possible a high degree of variability in usable eccentric screw pumps 2, 2 a, 2 b of different lengths L.

An inventive borehole pump 1, 1 a, 1 b comprises, in addition, an eccentric screw pump 2. This can be, for example, a longer version of an eccentric screw pump 2 a having a length La according to FIGS. 1B and 1 D, or else a shorter version of an eccentric screw pump 2 b having a length Lb according to FIGS. 10 and 1E.

The eccentric screw pump 2, 2 a, 2 b comprises in each case at least one stator 3, 3 a, 3 b and at least one rotor 4, 4 a, 4 b. In the case of an eccentric screw pump 2, 2 a, 2 b having several stators 3, 3 a, 3 b and/or rotors 4, 4 a, 4 b, it is logical for them to be oriented axially flush with one another.

The eccentric screw pump 2, 2 a, 2 b comprises at its upper end region 5 an upper sealing arrangement 6 and at a lower end region 7 that is situated opposite, a lower sealing arrangement 8.

In the inventive borehole pump 1, 1 a, 1 b, the eccentric screw pump 2, 2 a, 2 b is arranged in the receiving housing 10 in such a way that the lower sealing arrangement of the eccentric screw pump 2, 2 a, 2 b is assigned in a form- and/or force-fitting manner to the lower sealing region 11 of the receiving housing 10. In addition, the upper sealing arrangement 6 of the eccentric screw pump 2, 2 a, 2 b is assigned in a form- and/or force-fitting manner to one of the at least two upper sealing regions 12-1, 12-2 of the receiving housing 10.

The at least two upper sealing regions 12-1, 12-2 of the receiving housing 10 are cylindrical in shape and each comprise a contact surface 16 for the upper sealing arrangement 6 that is arranged in the upper end region 5 of the respective eccentric screw pump 2, 2 a, 2 b. In particular, the at least two upper sealing regions 12-1, 12-2, thanks to their inner wall, offer a smooth contact surface 16 for the upper sealing arrangement 6 of the eccentric screw pump 2, 2 a, 2 b. The upper sealing arrangement 6 preferably comprises a sealing element 61 in the form of a lamellar elastomer sealing 62 or the like, which seals off the pump body of the eccentric screw pump 2, 2 a, 2 b from the receiving housing 10.

In the embodiment of a long pipe described above, which is not illustrated, the upper sealing arrangement 6 of the eccentric screw pump 2, 2 a, 2 b, depending on its respective length L, La, Lb, is assigned in a form- and/or force-fitting manner to one of the at least two upper sealing regions 12-1, 12-2 of the receiving housing 10 or else to the identically formed region situated between the two upper sealing regions 12-1, 12-2.

FIGS. 2 through 4 show various enlarged views of a first embodiment of a borehole pump 1, 1 a according to FIGS. 1A, 1B and 1D. In particular, FIG. 2 shows the receiving housing 10 of an inventive borehole pump 1, 1 a. FIG. 3 shows a cross-section through a first long eccentric screw pump 2 a of an inventive borehole pump 1 a, and FIG. 4 shows a cross-section through a first eccentric screw pump 2 a of an inventive borehole pump 1 a that is arranged in the receiving housing 10.

The receiving housing 10 consists of a number of essentially pipe-shaped segments, arranged axially with one another, which have an inner diameter that is at least slightly greater than a maximum outer diameter of the eccentric screw pump 2 a. In the region of the at least two upper sealing regions 12-1, 12-2, the inner diameter is preferably reduced, to establish a form- and/or force-fitting operative connection between the upper sealing arrangement 6 of the eccentric screw pump 2 a and the upper sealing region 12-1 of the receiving housing 10.

The first long eccentric screw pump 2 a, shown in FIG. 3, has a length La, which corresponds essentially to the distance A1 between the lower sealing region 11 and the higher of the two upper sealing regions 12-1. In particular, the distance between the upper sealing arrangement 6 of the eccentric screw pump 2 a and the lower sealing arrangement 8 corresponds to the distance A1 between the lower sealing region 11 and the higher of the two upper sealing regions 12-1.

The lower sealing arrangement 8 of the eccentric screw pump 2 a comprises at least one sealing element 30 and first anchoring elements 31. The lower sealing region 11 of the receiving housing 10 comprises at least one contact surface 13 for the at least one lower sealing element 30 of the eccentric screw pump 2, 2 a, so that upon arranging the eccentric screw pump 2, 2 a inside the receiving housing 10 in addition to the sealing already described above in the upper end region 5 a sealing operative connection is established between the lower sealing element 30 of the eccentric screw pump 2, 2 a and the lower sealing region 11 of the receiving housing 10, so that the pump body of the eccentric screw pump 2, 2 a in the lower region of the receiving housing 10 is sealed off from the latter. Analogously to the upper sealing element 61 described above, the lower sealing element 30 of the lower sealing arrangement 8 of the eccentric screw pump 2, 2 a can likewise be configured as a lamellar elastomer sealing 35, which seals off the eccentric screw pump 2, 2 a from the contact surface 13 of the receiving housing 10.

It is also foreseen that second anchoring elements 14 are assigned to the lower sealing region 11 of the receiving housing 10 and establish a form- and force-fitting operative connection with the first anchoring elements 31 of the eccentric screw pump 2, 2 a in order to hold the eccentric screw pump 2, 2 a securely inside the receiving housing 10. For example, the first anchoring elements 31 are configured as catch hooks or pro-truding hooks 32 and the second anchoring elements 14 as corresponding recesses 15.

The catch hooks 32 engage in the recesses 15 and lock the eccentric screw pump 2, 2 a inside the receiving housing 10. This serves to apply the necessary holding force in order to fix the eccentric screw pump 2, 2 a securely in the receiving housing 10.

According to a preferred embodiment, the anchoring elements 14, 31 stand in a breakable operative connection and can easily be separated from one another in a determined operating position of the borehole pump 1, 1 a, in particular during a production standstill.

In the first embodiment of a borehole pump 1, 1 a, illustrated in FIGS. 2 through 4, the eccentric screw pump 2, 2 a arranged in the receiving housing 10 comprises, in particular, a long stator 3 a. This long stator 3 a is constructed, for example, of elastomer and is used for preliminary drainage of the borehole, in particular before the conveying of oil begins. For long-term conveyance, however, it can be advantageous to employ a different stator, in particular a shorter corrosion-resistant all-metal stator 3 b according to a second embodiment of a borehole pump 1, 1 b, illustrated in FIGS. 5 through 7. Replacing the eccentric screw pump 2 a, 2 b of a borehole pump 1 a, 1 b can be a simple matter, thanks to the breakable connection, as described above, between the receiving housing 10 and the respective eccentric screw pump 2 a, 2 b, without any need to dismantle the riser pipe 20.

FIGS. 5 through 7 present various enlarged views of a second embodiment of a borehole pump 1, 1 b according to FIGS. 1A, 10 and 1E. FIG. 5, in particular, shows the receiving housing 10 of an inventive borehole pump 1, 1 b. FIG. 6 shows a cross-section through a second short eccentric screw pump 2 b of an inventive borehole pump 1 b, and FIG. 7 shows a cross-section through a second eccentric screw pump 2 b of an inventive borehole pump 1 b, arranged in the receiving housing 10.

The second short eccentric screw pump 2 b, shown in FIG. 5, has a length Lb that essentially corresponds to the distance A2 between the lower sealing region 11 and the lower of the two upper sealing regions 12-2. In particular, the distance between the upper sealing arrangement 6 of the eccentric screw pump 2 b and the lower sealing arrangement 8 corresponds to the distance A2 between the lower sealing region 11 and the lower of the two upper sealing regions 12-2.

In FIGS. 5 through 7 the same reference numbers are used as those used in FIGS. 2 through 4 for the same technical features, so that it becomes possible to dispense with repeated description of these features and instead reference can be made to the description of FIGS. 1 through 4.

Instead, with reference to FIGS. 5 through 7 in connection with FIGS. 1A through 1E, a procedure is described for installing a borehole pump 1, 1 b inside a borehole, in particular at a lower end of a riser pipe 20 or a procedure for replacing a borehole pump 1, 1 b arranged at a lower end of a riser pipe 20.

In the context of one of the first working steps for arranging the riser pipe 20 in the borehole, the receiving housing 10 of the borehole pump 1, 1 b is fastened at the lower end of the riser pipe 20, for example, by means of a screw connection, a soldering connection or the like. From here on, the riser pipe is extended in segments and thereby is lowered into the borehole. Upon complete installation of the riser pipe 20 in the borehole, the eccentric screw pump 2, 2 b is fastened on a pump rod (not illustrated) and lowered into the receiving housing 10 through the riser pipe 20. The eccentric screw pump 2, 2 b is thus arranged in the receiving housing 10 in such a way that the upper sealing arrangement 6 of the eccentric screw pump 2, 2 b is assigned to the lower of the two upper sealing regions 12-2 of the receiving housing 10 in a sealing manner and that the lower sealing arrangement 8 of the eccentric screw pump 2, 2 b is assigned to the lower sealing region 11 of the receiving housing 10 in a sealing manner.

In replacing a borehole pump 1, 1 a, 1 b arranged at a lower end of a riser pipe 20, in particular only the eccentric screw pump 2, 2 a, 2 b is separated from the receiving housing 10 of the borehole pump 1, 1 a, 1 b fastened at the lower end of the riser pipe 20 and removed through the riser pipe 20 by means of the pump rod. Thereafter a new eccentric screw pump 2, 2 a, 2 b is fastened on the pump rod, inserted through the riser pipe 20 and arranged in a sealing manner inside the receiving housing between the lower sealing region and one of the at least two upper sealing regions of the receiving housing.

Depending on whether the length of the eccentric screw pump corresponds to the distance between the lower sealing region and the first upper sealing region or else to the distance between the lower sealing region and the second upper sealing region, it can be necessary for the pump rod to be lengthened or shortened accordingly.

If a borehole pump 1, 1 a had already been present in the borehole and is to be replaced by a borehole pump 1 b, then at first only the eccentric screw pump 2, 2 a of the borehole pump 1, 1 a is released from the receiving housing 10 of the borehole pump 1, 1 a fastened at the lower end of the riser pipe 20 and removed by means of the pump rod through the riser pipe 20. Thereafter, a new eccentric screw pump 2, 2 b is fastened on the pump rod, inserted through the riser pipe 20 into the borehole and arranged in a sealing manner inside the receiving housing 10, thus forming a new borehole pump 1, 1 a, 1 b.

The embodiments, examples and variants of the forgoing paragraphs, the claims or the following description and drawings, including their various views or respective individual features, can be used independently of one another or in any combination. Features described in connection with one embodiment are applicable for all embodiments, provided the features are not incompatible. In addition, it is understood that, although a certain arrangement of the components is disclosed in the embodiment presented, other arrangements can make use of them.

The invention has been described with reference to a preferred embodiment. However, it is possible, for a person skilled in the art, that variations or modifications of the invention can be made without thereby departing from the scope of protection of the following patent claims. It is possible to apply some of the components or features of one of the examples in combination with features or components of a different example. 

1. A borehole pump comprising, an eccentric screw pump having at least one stator and at least one rotor; wherein the eccentric screw pump has, in its upper end region, in each case an upper sealing arrangement; wherein the eccentric screw pump has, in its lower end region, in each case a lower sealing arrangement; a receiving housings having a lower sealing region and at least two upper sealing regions; wherein the eccentric screw pump is arranged in the receiving housing such that the lower sealing arrangement of the eccentric screw pump is assigned in a form- and/or force-fitting manner to the lower sealing region of the receiving housing and such that the upper sealing arrangement of the eccentric screw pump is assigned in a form- and/or force-fitting manner to one of the at least two upper sealing regions of the receiving housing.
 2. The borehole pump according to claim 1, wherein the at least two upper sealing regions of the receiving housing are in each case at a defined distance from the lower sealing region, which is distinguished from one another.
 3. The borehole pump according to claim 1, wherein the at least two upper sealing regions of the receiving housing are configured identically at least in part and in each case include a contact surface for an upper sealing arrangement that is arranged in the upper end region of the eccentric screw pump.
 4. The borehole pump according to claim 3, wherein the upper sealing arrangement of the eccentric screw pump is a lamellar elastomer sealing, such that a form- and/or force-fitting operative connection exists between the lamellar elastomer sealing and one of the at least two upper sealing regions of the receiving housing.
 5. The borehole pump according to claim 1, wherein the receiving housing is arranged and fastened at a lower end of the riser pipe.
 6. The borehole pump according to claim 1, wherein the stator of the eccentric screw pump toward the top includes an extension, in particular an extension through a pipe, such that the upper sealing arrangement of the eccentric screw pump is arranged at an upper end region of the extension.
 7. The borehole pump according to claim 1, wherein the lower sealing arrangement of the eccentric screw pump includes at least one sealing elements and first anchoring elements and such that the lower sealing region of the receiving housing includes a contact surface for the at least one sealing element arranged in the lower end region of the eccentric screw pump, as well as second anchoring elements, such that a form- and force-fitting operative connection is established between the first anchoring elements and the second anchoring elements.
 8. The borehole pump according to claim 7, wherein the sealing element of the lower sealing arrangement of the eccentric screw pump is a lamellar elastomer sealing and such that the first anchoring elements are protruding hooks and such that the second anchoring elements are recesses, into which the first anchoring elements engage.
 9. The borehole pump according to claim 1, wherein the eccentric screw pump is replaceable.
 10. The borehole pump according to claim 1, wherein the borehole pump can be equipped and operated with various eccentric screw pumps of various stator lengths.
 11. A procedure for installing a borehole pump at a lower end of a riser pipe, said borehole pump comprising an eccentric screw pump with an upper sealing arrangement at an upper end region and a lower sealing arrangement at a lower end region, and a receiving housings having a lower sealing region and at least two upper sealing regions; such that the eccentric screw pump is arranged between the lower sealing region of the receiving housing and one of the at least two upper sealing regions of the receiving housing; said installation including the following procedural steps: installation of the receiving housing at the upper end of the riser pipe; insertion of the eccentric screw pump with an upper sealing arrangement and a lower sealing arrangement through the riser pipe; and sealing arrangement of the eccentric screw pump inside the receiving housing between the lower sealing region and one of the at least two upper sealing regions.
 12. A procedure for replacing a borehole pump arranged at a lower end of a riser pipe, said borehole pump comprising an eccentric screw pump with an upper sealing arrangement at an upper end region and a lower sealing arrangement at a lower end region, and a receiving housing having a lower sealing region and at least two upper sealing regions; such that the eccentric screw pump is arranged between the lower sealing region of the receiving housing and one of the at least two upper sealing regions of the receiving housing; the replacement including the following procedural steps: de-installation of the eccentric screw pump from the receiving housing of the borehole pump; removal of the eccentric screw pump through the riser pipe; insertion of a new eccentric screw pump with an upper sealing arrangement and a lower sealing arrangement through the riser pipe; and sealing arrangement of the new eccentric screw pump inside the receiving housing between the lower sealing region and one of the at least two upper sealing regions.
 13. The borehole pump according to claim 2, wherein the at least two upper sealing regions of the receiving housing are configured identically at least in part and in each case include a contact surface for an upper sealing arrangement that is arranged in the upper end region of the eccentric screw pump. 